I'm trying to use the Discover call by working with one of the pre-made examples and I cannot get it to work.

Here is my call:

https://api.themoviedb.org/3/discover/movie?primary_release_date.gte=2014-09-15&primary_release_date.lte=2014-10-22?api_key=###

And yes I am putting in my api_key, and it has worked on other calls such as a basic movie id lookup:

https://api.themoviedb.org/3/movie/550?api_key=###

Can I get a quick pointer for what I'm doing wrong?